Which option is the correct command to define an interface as Layer 2 on the Cisco ASR 9000?

Which option is the correct command to define an interface as Layer 2 on the Cisco ASR 9000?

A.
RP/0/RSP0/CPU0:R1(config)#int gigabitEthernet 0/6/0/0 l2transport

B.
RP/0/RSP0/CPU0:R1(config)#int gigabitEthernet 0/6/0/0 layer2

C.
RP/0/RSP0/CPU0:R1(config)#int gigabitEthernet 0/6/0/0 switchport

D.
RP/0/RSP0/CPU0:R1(config)#int gigabitEthernet 0/6/0/0 xconnect

Explanation: